Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2of this chapter).

Emerging growth company o

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

Item 7.01. Regulation FD Disclosure.

As previously disclosed in the Quarterly Report on Form 10-Q of AmerisourceBergen Corporation (the "Company") filed with the U.S. Securities and Exchange Commission on February 6, 2018, after U.S. Food and Drug Administration (FDA) inspections, the Company voluntarily suspended production activities in December 2017 at PharMEDium's 503B outsourcing facility located in Memphis, Tennessee, pending execution of certain remedial measures.

Production at PharMEDium's Memphis outsourcing facility remains voluntarily suspended while the Company completes certain remediation measures. The Company is in active communication with the FDA, plans to provide a further update to the agency upon the completion of such remediation measures, and is working to resume production at the Memphis facility as soon as possible thereafter. The Company will provide a financial update when it reports its fiscal second quarter results. That announcement and conference call will take place before the market opens on Tuesday, May 8, 2018.

The Company's top priority remains patient safety and the Company is dedicated to achieving full regulatory compliance. There is compelling patient need and significant market demand for safe and effective compounded sterile preparation products. PharMEDium remains committed to being the market leader in quality and the trusted partner to our customers for their outsourced compounded sterile preparation needs.

Cautionary Note Regarding Forward-Looking Statements

Certain of the statements contained in this Current Report on Form 8-K are “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Words such as “expect,” “likely,” “outlook,” “forecast,” “would,” “could,” “should,” “can,” “project,” “intend,” “plan,” “continue,” “sustain,” “synergy,” “on track,” “believe,” “seek,” “estimate,” “anticipate,” “may,” “possible,” “assume,” variations of such words, and similar expressions are intended to identify such forward-looking statements. These statements are based on management’s current expectations and are subject to uncertainty and change in circumstances. These statements are not guarantees of future performance and are based on assumptions that could prove incorrect or could cause actual results to vary materially from those indicated. Among the factors that could cause actual results to differ materially from those projected, anticipated, or implied are the following: unfavorable trends in brand and generic pharmaceutical pricing, including in rate or frequency of price inflation or deflation; competition and industry consolidation of both customers and suppliers resulting in increasing pressure to reduce prices for the Company’s products and services; changes in pharmaceutical market growth rates; changes in the United States healthcare and regulatory environment, including changes that could impact prescription drug reimbursement under Medicare and Medicaid; increasing governmental regulations regarding the pharmaceutical supply channel and pharmaceutical compounding; declining reimbursement rates for pharmaceuticals; federal and state government enforcement initiatives to detect and prevent suspicious orders of controlled substances and the diversion of controlled substances; increased public concern over the abuse of opioid medications; prosecution or suit by federal, state and other governmental entities of alleged violations of laws and regulations regarding controlled substances, and any related disputes, including shareholder derivative lawsuits; increased federal scrutiny and litigation, including qui tam litigation, for alleged violations of laws and regulations governing the marketing, sale, purchase and/or dispensing of pharmaceutical products or services, and associated reserves and costs, including the reserve recorded in connection with the proceedings with the United States Attorney’s Office for the Eastern District of New York; material adverse resolution of pending legal proceedings; the retention of key customer or supplier relationships under less favorable economics or the adverse resolution of any contract or other dispute with customers or suppliers; changes to customer or supplier payment terms; risks associated with the strategic, long-term relationship between Walgreens Boots Alliance, Inc. and the Company, including principally with respect to the pharmaceutical distribution agreement and/or the global generic purchasing services arrangement; changes in tax laws or legislative initiatives that could adversely affect the Company’s tax positions and/or the Company’s tax liabilities or adverse resolution of challenges to the Company’s tax positions; regulatory action in connection with the production, labeling or packaging of products compounded by the Company’s compounded sterile preparations (CSP) business; suspension of production of CSPs, including a prolonged suspension at the Company’s Memphis 503B outsourcing facility; failure to realize the expected benefits from the Company’s reorganization and other business process initiatives; managing foreign expansion, including non-compliance with the U.S. Foreign Corrupt Practices Act, anti-bribery laws and economic sanctions and import laws and regulations; declining economic conditions in the United States and abroad; financial market volatility and disruption; substantial defaults in payment, material reduction in purchases by or the loss, bankruptcy or insolvency of a major customer; the loss, bankruptcy or insolvency of a major supplier; changes to the customer or supplier mix; malfunction, failure or breach of sophisticated information systems to operate as designed; risks generally associated with data privacy regulation and the international transfer of personal data; natural disasters or other unexpected events that affect the Company’s operations; the impairment of goodwill or other intangible assets, resulting in a charge to earnings; the acquisition of businesses that do not perform as expected, or that are difficult to integrate or control, including the integration of H. D. Smith and PharMEDium, or the inability to capture all of the anticipated synergies related thereto or to capture the anticipated synergies within the expected time period; the effects of disruption from the transactions on the respective businesses of the Company and

H. D. Smith and the fact that the transactions may make it more difficult to establish or maintain relationships with employees, suppliers, customers and other business partners; the disruption of the Company’s cash flow and ability to return value to its stockholders in accordance with its past practices; interest rate and foreign currency exchange rate fluctuations; and other economic, business, competitive, legal, tax, regulatory and/or operational factors affecting the Company’s business generally. Certain additional factors that management believes could cause actual outcomes and results to differ materially from those described in forward-looking statements are set forth (i) in Item 1A (Risk Factors) in the Company’s Annual Report on Form 10-K for the fiscal year ended September 30, 2017 and elsewhere in that report and (ii) in other reports filed by the Company pursuant to the Securities Exchange Act.

Regulation FD Disclosure

The information in this Current Report on Form 8-K is being furnished to the Securities and Exchange Commission and shall not be deemed “filed” for purposes of Section 18 of the Exchange Act, or otherwise subject to the liabilities of that section. This information shall not be deemed to be incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.